From 1927 to 1989, the Horne mine produced 53.7 Mt of ore grading 6.1 glt Au and 2.2% Cufrom two large volcanogenic massive sulphide deposits composed primarily of pyrrhotite, pyrite and chalcopyrite. The orebodies were hosted by a package of chlorite-sericite altered epiclastic rhyolite tuffs which were deposited in a narrow palaeo-graben located on the flank of a major felsic volcanic centre. Mineralizingfluids percolated upward through the permeable footwall rocks and were further focussed...

Mine Gallen is a zinc-rich pyritic volcanogenic massive sulphide deposit that occurs in a fault-bounded block of intermediate volcanic rocks. The block is completely surrounded at the present erosion level by the eastern part of the Lac Dufault granodiorite. The volcanic succession includes a massive feldspar porphyry that is probably a subvolcanic intrusion, an andesitic flow unit and lapilli tuffs. The latter are variably sericitized and pyritic, especially in the vicinity of the massive...

The Archean Blake River Group is best known from a central volcanic complex in Rouyn-Noranda. This volcano-tectonic depression, delimited by the Hunter Creek fault to the north and the Horne Creek fault to the south, is interpreted to be a cauldron approximately 20 km in diameter. Its western and eastern boundaries are the Flavrian Plutonand the D'Alembert shear zone respectively. The complex has an exposed stratigraphic thickness of 10.5 km. Two cycles, composed of andesitic units overlain...

The Eastern Abitibi Subprovince (Quebec segment), contains two main types of gold deposits: the common quartz-vein type and the rare pyritic type. Both occur in areas dominated by volcanic rocks and are spatially associated with major fault zones. Quartz-vein gold deposits consist of simple to complex networks of quartz-carbonate-pyrite veins in reverse shear zones and extensional fractures. They occur in areas dominated by mafic volcanic rocks and are commonly associated with small syn-to-la...

The Ansil deposit is located in the Noranda mining camp in the southern part of the Abitibi greenstone belt. It was discovered in 1981 and production began in 1989 with proven reserves of 1.58 Mt grading 7.2% copper, 0.9% zinc, 26.5 glt of silver and 1.6 glt of gold. It is centered at a depth of 1.3 kilometre and represents one of the deepest ore discoveries ever made from surface.The deposit consists of a single massive sulphide lens located at the contact between the Northwest Rhyolite and...